Looks like it is solved, thanks for hungarian support fast reaction (Peter Koleszar). The problem was out of DECO, it is router/dhcp/arp problem. After flushing the router's ARP table, problem...

Hello Folks! A few days ago I experienced that the IOS 17.1.2 devices (iphone) did not get internet connectivity via deco wifi, but can have internet connection via same ISP and same subnet with...